Concrete-floor mold



Sept. 4, 1928. 1,682,750

W. s. HALDEMAN CONCRETE FLOOR- MOLD Filed Feb. 10,1922 3 Sheets-Sheet 1 SHQ: Haifa Sept. 4, 1928.

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Sept. 4, 1928.

1,682,750 w..s. HALDEMAN CONCRETE FLOOR MOLD 3 Sheng-sheet 3 Filed Feb. 1o. 1922 .Patented Sept. e, 192e.

UNITED STATES 1,682,721() PATENT OFFICE.

WALTER S. HALDEMAN, OF CHICAGO, ILLINOIS, ASSIGNOR', BY MESN ASSIGNMENTS, TO THE BERGER MANUFACTURING GOMIANY, F CANTON, OHID, A CORPORATION solicitara-noon. HOLD.

Application med 4Februar-y 1o, i922. serial No. 5355er.

The invention relates to the construction of concrete floors to produce a monolithic formation of the girders, the joists and the iloor slab; and the object ot the improvement is` 'c to combine a wood and metal mold and core forl the joist/s and slab, which can be readily assembled 'to form lconcrete joists of different depths and widths.

Floor joists oi ymany diderent depths and widths .must be built to .meet the varying' loads and strains imposed upon different doors, and the formation ot the same by transversely arched cores .made entirely of sheet metal, requires so many sizes and shapes la of cores as to render their use burdensome,

it not prohibitory in ordinary building construction.

Likewise, the maldng or such cores entirely ot wood requires so much lumber, especially tor the top or span plates which must have considerable thickness to support the load of `a green cement slab, as to make the cost burdensome, it not prohibitory in ordinary building construction.

rllhe present invention involves the use oi wooden planks tor the somt and sides of a` joist mold, combined with sheet metal plates,

provided with a continuous series ot corrugations extending transversely straight throughout the body ci lthe plate and being arched'downward at the edges only for restin upon the upper edges ot the side planks an iorming top plates oit the core thus made, support the slab between the joists ot the oor.

The shallow sheet metal core plates thus formed may be provided withbase flanges,

` either plain or corrugated, extending along each side tor resting upon the upper edges oi' the side planks, and also with a depending transverse web having a base Bange at one end, for sustaining `the overlapping edge or an adjoining core plat/e and strengthening the joints between the plates.

Preferred embodiment ci the invention is illustrated in the accompanying drawings,

forming part hereof, in whichliigure Il is an elevation section ot a door across a girder and through the slab between' adjacent joists, showing the joist molds and the slab cores and their temporary supports in poSition;4

lli 2, a cross section of joists and slab on line l--lli/,Fig l;

Fig. 3, a perspective view of the improved top plate; Y Fig. 4,'an elevation section of a door across a girder and through the slab between adjacent 'oists, showing the method of thickenmg t e slab adjacent to its junction with the girder;

Flg. 5, a perspective view oi a modified coreplate with corrugatedside flanges;

Fig. 6, an elevation section of a. door across a girder and through a slab between adjacent Joists, showing another method of thickening the slab adjacent to its junction .with the girder, with another modified lcore plate;

Fig. 7, a perspective view of the modied core plate, shown in Figtl; and

Fig. 8, a perspective view ci a *further modification oi the core plate.

Similar numerals refer to similar parte throughout the drawings.

The joist mold may be made ci a soilit plank 6 laid atwifse upon a temporary support 7, and side planlzs 8 set edgewise upon or along s1de the soiiit plank., and the sainemay be held in position by side' strips i9 secured to the temporary support along side the base of the mold thus formed in whicha concrete joist l0 may be formed. 'llhe width and depthfof the concrete joists is determined by the width and spacing oit the sot and side planks, and earn-oi" course, be varied at will to meet the requirements oi' any particular construction. y

The shallow core plates l1 or l-l are made of sheet metal in the form of a dat body and arched edges 4with base @anges l2 or l2 on each side, which @anges may be made plain, as shown in Fig. 3, or corrugated, as shown in Fig. 5; and the body oi the plates may be provided with a continuous series of transversely extending corrugations as shown, which gives them sncient strength to s an a considerable space between the mol for adjacent joists.,

One end of each core plate is curved or deflected downward to form a transverse depending web 13, which may have a base dange 14 on its lower. edge connecting the side flanges of the core; thus giving a web-truss support tor stidening and strengthening this end of the plate, and supporting the overlapped end of an adjoining plate.

In use, the coreplates are placed with their side anges on the top edges or the side planlrs of adjacent joist molds, and may be secured in position by nails or other fastening means, whereupon concrete may be poured into the joist molds and upon the core plates to form the joist 10 and the slab 16 of the floor. After the concrete is set and hardened the `mold planks and the core plates may be readily removed after withdrawing the supports, or the core plates may remain in the floor, as ma be desired. v

he ends `8' of the side planks may be inclined or beveled on their upper edges adjacent to their junction with the side planks 17 forming the girder mold between the .joist molds; so that the terminal core late 11 on each side of the girder 18 will e inclined downward to gradually thicken the depth of the slab and increase the strength of the T- head 16 formed by the junction of the slab with the irder, as shown in Fig. 4.

0r a atter core plate 11"'.ma-y be used upon the side planks of the joist mold immediately adjoining each side of the girder mold, to thicken the depth ofthe slab and increase the strength of the T-he'ad 16 formed by the junction of the slab with the girder, as shown in Fig. 6.

In the latter event the core plate maybe formed as shown in Fig. 7, with the lower curves of the corrugations in substantially the same plane with the base flanges 12 along each side, and the upper curves of the corru- 85 ed e-arche core plates.

gations rising alon the plane of the base flanges, to 've the` at body formation to the t will .be understood that the use of base flanges along the sides of the transversely cort.

rugated core plate is not essential, and they may be omitted from the hi her or lower forms of flat-body edgearche plates 11, 11 and 11, in which event the downturned ends of the corrugations will rest directl upon the upper edge'sof the side planks o the joist molds. y j

It will also be understood that in some instances, where the space between joist molds is notgreat, or the thickness of the slab does not impose a heavy load, the transversely corrugated core plate need not be arched or flanged at all and may take the form shown in Fig. 8; but the atarched form of core plates with plain base flanges on each side is preferred for the added strength given by the arch, and the greater facilityI for neatly tit ting and bein secured to t 1e ed es of the mo d planks w ich is given by the anges.

I- claim 1. A mold for concrete Hoor joist and the :like made of sollit and side planks, and flatarched sheet-metal core plates for a concrete slab spanning the space between the side planks of adjacent joist molds, each core plate aving a transverse depending web on one endbverlapped by the opposite end of an adjoining plate.

.2. A mold for concrete floor joist and the like made of sollit and side planks', and flatarched sheet-metal core for a concrete slab spanning the space between the side planks of adjacent joist molds, each core plate having a transverse depending web with a base lange on one end overlapped. by the opposite end o; an adoining plate.

i JWALTER S. HALDEMAN. 

